High performance dielectric film using SiO>sub>2-coated short carbon nanotubes in BaTiO3-polymer composite

Three-phase composite films consisting of BaTiO₃/singlewalled carbon nanotube (SWCNT)/polymer were fabricated. The SWCNTs were shortened and coated with SiO₂ to minimise the conducting paths of the SWCNTs in the film. The film showed a dielectric constant and dielectric loss of 92 and 0.031, respectively, at a frequency of 1 kHz. The SiO₂-coated short SWCNTs can play important roles in enhancing the capacitance by space charge polarisation at the interface between the SWCNTs and SiO₂, and reducing the dielectric loss.